CN205406620U - Pin and secondary cell are connected to utmost point ear - Google Patents

Abstract

The utility model relates to a secondary cell produces technical field, especially relates to a pin and secondary cell are connected to utmost point ear, and the pin is connected including utmost point support connnection spare and holder to utmost point ear, the holder connects portion and clamping part including drawing, draw connect the portion with utmost point support connnection spare links to each other, the clamping part with it connects to draw the portion of connecing, the clamping part includes connection piece and two holding pieces, two the holding piece sets up relatively, and two the holding piece passes through the connection piece links to each other, two all there is the centre gripping district in the both sides that the holding piece is relative, and two interval between the centre gripping district of holding piece is greater than the thickness of utmost point ear, forms the centre gripping space of centre gripping utmost point ear, wherein at least one it is moved towards to have a region on the holding piece buckling in the inside in centre gripping space, makes the regional correspondence the width in centre gripping space is not more than the thickness of utmost point ear. The electric connection performance between utmost point ear and pin can be guaranteed effectively in this application, and this structure security performance is high simultaneously.

Description

Tab connection pins and secondary battery

technical field

The present application relates to the technical field of secondary battery production, in particular to a tab connection pin and a secondary battery.

Background technique

At present, secondary batteries have been widely used in portable electronic devices such as mobile phones, digital cameras, and laptops due to their advantages such as high energy density, high power density, high cycle times, and long storage time. Electric vehicles such as electric bicycles and large and medium-sized electric equipment such as energy storage facilities have broad application prospects. This application of lithium-ion batteries has contributed to solving the energy crisis and environmental pollution.

With the improvement of electric vehicle technology, electric vehicles and hybrid vehicles are getting closer to people's daily life. At the same time, electric vehicles have put forward higher requirements for the safety performance of lithium-ion batteries that provide energy for them.

The positive and negative pole lugs of the bare battery core of the existing battery core are located on both sides respectively, and the top cover pin and the pole lug are electrically connected by ultrasonic welding or resistance welding, so as to realize the conduction of the battery current from the inside to the pole lug. Outside the cell, under normal circumstances, for safety reasons, a weak safety valve structure will be set on the top cover to ensure that the safety valve can be opened to discharge the gas inside the cell in time when the cell fails to avoid explosion, etc. security incident. But when the lug and the pin are laser welded, the frequency of welding will make the safety valve invalid.

At the same time, for high-power batteries, the internal resistance of the required batteries is small. For the top cover structure, the main part of the resistance is the structural resistance of the pins. The resistance is proportional to the length and inversely proportional to the cross section. For the cell structure, the length and width of the reverse space have been limited, and the resistance is generally reduced by increasing the thickness of the pins. However, the total thickness that can be welded by ultrasonic welding has a certain limit, especially when the welding thickness is greater than 2 to 3mm, poor welding such as virtual welding will occur, which will affect the electrical performance of the battery cell.

Utility model content

The present application provides a tab connection pin and a secondary battery, which can effectively ensure the electrical connection performance between the tab and the pin, and at the same time, the structure has high safety performance.

The tab connection pin provided in the present application includes a pole connecting piece and a clamping piece, the clamping piece includes a leading portion and a clamping portion, the leading portion is connected with the pole connecting piece, the clamping The holding part is connected with the connecting part, the clamping part includes a connecting piece and two clamping pieces, the two clamping pieces are arranged opposite to each other, and the two clamping pieces are connected through the connecting piece, the two clamping pieces There are clamping areas on opposite sides of the clamping pieces of the block, and the distance between the clamping areas of the two clamping pieces is greater than the thickness of the tabs, forming a clamping space for clamping the tabs, wherein at least There is a region on one of the clamping pieces that is bent towards the inside of the clamping space, so that the width of the clamping space corresponding to the region is not greater than the thickness of the tab.

Preferably, the leading portion is connected to one of the clamping pieces.

Preferably, the lead part is integrated with one of the clamping pieces, and there is a region on the other clamping piece opposite to the lead part that is bent toward the inside of the clamping space, so that The width of the clamping space is not greater than the thickness of the tab.

Preferably, the length of the clamping piece integrally provided with the connecting portion is greater than the length of the other clamping piece.

Preferably, the lead portion is connected to the connecting piece.

Preferably, the region on each clamping piece is bent toward the other connecting piece, and the distance between the clamping area and the other clamping piece is reduced.

Preferably, the two clamping pieces are arranged symmetrically.

Preferably, the length of the connecting piece is shorter than the length of the clamping piece.

Preferably, the leading portion and the pole connector are perpendicular to each other.

Based on the above tab connection pins, the present application also provides a secondary battery, including a battery cell, a tab, a top cover, a pole and a tab connection pin, the top cover is located on the top of the battery cell, The pole lug protrudes from the side of the battery core and extends in the vertical direction, the pole passes through the top cover, the pole connector is electrically connected to the pole, and the pole The ears are located in the clamping space, and the two connecting pieces are respectively located on the two outer sides of the tabs, wherein at least one of the clamping pieces is bent toward the inside of the clamping space, so that The width of the clamping space is reduced to be not greater than the thickness of the tab.

The technical solution provided by this application can achieve the following beneficial effects: the tab connection pin provided by this application can effectively ensure the electrical connection performance between the tab and the pin, and at the same time, the structure is simple and reliable, and will not affect the thickness of the pin. Limit.

It is to be understood that both the foregoing general description and the following detailed description are exemplary only and are not restrictive of the application.

Description of drawings

FIG. 1 is a schematic structural view of the bare cell assembly provided in the embodiment of the present application;

Fig. 2 is a top view of the assembly of bare cells before the lug connection pins are clamped according to the embodiment of the present application;

FIG. 3 is an enlarged schematic diagram of part A of FIG. 2;

Fig. 4 is a top view of the assembled bare cell after the lug connection pins are clamped according to the embodiment of the present application;

FIG. 5 is an enlarged schematic diagram of part B of FIG. 4;

Fig. 6 is a schematic structural view of the lug connection pin before clamping provided by the first embodiment of the present application;

Fig. 7 is a schematic structural diagram of the clamped lug connection pin provided by the first embodiment of the present application;

Fig. 8 is a schematic structural diagram of the lug connection pin before clamping provided by the second embodiment of the present application;

FIG. 9 is a schematic structural diagram of the clamped lug connection pin provided by the second embodiment of the present application.

Reference signs:

1- tab connection pin;

10-pole connector;

20-clamping piece;

201-leading department;

202-clamping part;

2021-connection piece;

2022-clamping piece;

2- pole ear;

3-pole;

4-cell;

5- Top cover.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

detailed description

The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings. The "front", "rear", "left", "right", "upper" and "lower" mentioned in the text are all referred to the placement state of the tab connection pins and the secondary battery in the drawings.

As shown in FIG. 6 and FIG. 7 , the embodiment of the present application provides a lug connection pin 1 , including a pole connection piece 10 and a clamping piece 20 , the clamping piece 20 includes a lead part 201 and a clamping part 202 , The lead part 201 is connected to the pole connector 10, and the clamping part 202 is connected to the lead part 201. The clamping part 202 includes a connecting piece 2021 and two clamping pieces 2022. The two clamping pieces 2022 are arranged oppositely, and the two clamping pieces The holding pieces 2022 are connected through the connecting piece 2021. There are clamping areas on both sides of the two holding pieces 2022, and the distance between the holding areas of the two holding pieces 2022 is greater than the thickness of the tab 2, forming a clamping area. In the clamping space of the tab 2, at least one of the clamping pieces 2022 has an area that is bent towards the inside of the clamping space, so that the width of the clamping space corresponding to the area is not greater than the thickness of the tab 2, wherein, The area is located anywhere between the clamping area and the part where the clamping piece 2022 is connected to the connecting piece 2021 . In the embodiment shown in FIG. 6 and FIG. 7 , the leading part 201 is connected to one of the clamping pieces 2022 . And another piece of clamping piece is positioned at the area between the clamping area and the position that clamping piece 2022 is connected with connecting piece 2021 and is bent towards another piece of connecting piece 2021, like this, when tab is positioned between two clamping pieces 2022 , bend the clamping piece towards the tab 2, and make the clamping piece close to the tab 2, and continue to press the clamping piece, so that the two clamping pieces 2022 clamp the tab .

In the embodiment shown in Fig. 6 and Fig. 7, the lead part 201 is integrated with one of the clamping pieces 2022, and there is an area on the other clamping piece 2022 opposite to the lead part 201 that is directed towards the clamping space. The inside is bent so that the width of the clamping space is not greater than the thickness of the tab 2 , wherein the region is located at any position between the clamping area and the part where the clamping piece 2022 is connected to the connecting piece 2021 .

Such arrangement reduces the number of parts and avoids the welding process, thus making the structure and processing easier.

Wherein, the length of the clamping piece 2022 integrally provided with the connecting portion 201 is greater than the length of the other clamping piece 2022 . This setting is also to make the two clamping pieces 2022 cooperate more closely to a certain extent, and prevent the tab 2 from falling off from the clamping piece 2022 .

As shown in FIG. 8 and FIG. 9 , the lead portion 201 may also be connected to the connection piece 2021 . Each clamping piece 2022 is positioned at the region of any position between the clamping region and the position where the clamping piece 2022 is connected to the connecting piece 2021 and can be bent toward the other connecting piece 2021, and the clamping region is clamped with the other piece. The spacing between sheets 2022 is reduced.

In this way, when the tab is located between the two clamping pieces 2022, the two clamping pieces 2022 can be bent toward each other, thereby clamping the tab.

In the embodiment shown in FIG. 8 and FIG. 9 , the two clamping pieces are symmetrically arranged, on the one hand, it is also for better clamping the tabs, and on the other hand, the symmetrical arrangement makes the battery cell easy to install.

In the embodiment shown in FIG. 8 and FIG. 9 , the length of the connecting piece 2021 is shorter than the length of the clamping piece 2022 .

This is because the clamping piece 2022 exerts force in the direction opposite to each other when clamping the tab 2, and the connecting piece 2021 and the two clamping pieces 2022 are vertically arranged, and the connecting piece 2021 exerts a force on the clamping piece 2022. The force opposite to the clamping direction of the clamping piece 2022 sets the length of the connecting piece 2021 to be shorter than the length of the clamping piece 2022, which reduces the opposite force to a certain extent, thus making the tab 2 are clamped more tightly by the clamping piece 2022.

In the present application, the leading portion 201 and the pole connector 10 are perpendicular to each other, such setting can make the installation more convenient.

As shown in Figures 1 to 5, based on the above tab connection pin 1, the present application also provides a secondary battery, including a battery cell 4, a tab 2, a top cover 5, a pole 3 and a tab connection lead The pin 1 and the top cover 5 are located on the top of the cell 4. The tab 2 protrudes from the side of the cell 4 and extends in the vertical direction. The pole 3 passes through the top cover 5. The pole connector 10 is connected to the pole 3 connection, the tab 2 is located in the clamping space, the connecting piece 2021 is located outside the tab 2, the two connecting pieces 2021 are located on both sides of the tab 2, and at least one clamping piece 2022 is located in the clamping area and clamping The area between the connecting piece 2022 and the connection piece 2021 is bent toward the inside of the clamping space, and the width of the clamping space is reduced to not greater than the thickness of the tab 2, tightening the tab 2.

Wherein, the secondary battery in the present application may be a lithium ion battery, a sodium ion battery, a zinc ion battery, or the like.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A lug connection pin, characterized in that it includes a pole connection piece and a clamping piece, The clamping part includes a lead part and a clamping part, the lead part is connected to the pole connector, the clamping part is connected to the lead part, The clamping part includes a connecting piece and two clamping pieces, the two clamping pieces are arranged opposite to each other, and the two clamping pieces are connected through the connecting piece, and the two opposite clamping pieces There are clamping areas on both sides, and the distance between the clamping areas of the two clamping pieces is greater than the thickness of the tab, forming a clamping space for clamping the tab. There is a region on at least one of the clamping pieces that is bent toward the interior of the clamping space, so that the width of the clamping space corresponding to the region is not greater than the thickness of the tab. 2 . The tab connection pin according to claim 1 , wherein the lead part is connected to one of the clamping pieces. 3 . 3. The tab connection pin according to claim 2, characterized in that, the lead part is integrated with one of the clamping pieces, and the other clamping piece opposite to the lead part is There is a region bent toward the inside of the clamping space, so that the width of the clamping space is not greater than the thickness of the tab. 4 . The tab connection pin according to claim 3 , wherein the length of the clamping piece integrally provided with the connecting portion is greater than the length of the other clamping piece. 5 . 5 . The tab connection pin according to claim 1 , wherein the lead portion is connected to the connecting piece. 6 . 6. The tab connection pin according to claim 5, characterized in that, the region on each clamping piece is bent toward the other connecting piece, and the clamping region is in contact with the other connecting piece. The distance between the other clamping pieces is reduced. 7. The tab connection pin according to claim 6, wherein the two clamping pieces are arranged symmetrically. 8 . The tab connection pin according to claim 5 , wherein the length of the connecting piece is smaller than the length of the clamping piece. 9 . 9. The tab connection pin according to any one of claims 1 to 8, characterized in that, the leading part and the pole connecting piece are perpendicular to each other. 10. A secondary battery, characterized in that it comprises a battery cell, a tab, a top cover, a pole and the tab connection pin according to any one of claims 1 to 9, The top cover is located on the top of the battery core, the tab protrudes from the side of the battery core and extends vertically, the pole passes through the top cover, and the pole is connected to The piece is electrically connected to the pole, the tab is located in the clamping space, and the two connecting pieces are respectively located on the two outer sides of the tab, and the area on at least one of the clamping pieces is directed towards The inside of the clamping space is bent, and the width of the clamping space is reduced to be not greater than the thickness of the tab.